62 WEEDS OF THE FARM AND GARDEN 



ity. Among the most conspicuous roadside weeds are the 

 greater ragweed, small ragweed, meadow sunflower, arti- 

 choke, bull thistle, dog fennel, beggar-ticks, marsh elder, 

 fetid marigold, velvet weed, Jimson weed, cocklebur, 

 mustard, mullein, Canada thisitle, woolly thistle, squirrel- 

 tail grass, wild barley, sweet clover, annual brome grass, 

 black medic, bur clover, dodder (the last three espe- 

 cially common in Colorado), tumbling mustard, Russian 

 thistle, fireweed (especially common in the West), Mex- 

 ican poppy (Texas), capitate croton (Missouri to 

 Texas), sneeze weed, and buffalo bur (common from Col- 

 orado to Texas). Sunflower and marsh elder are very 

 frequently seen in Kansas, Nebraska, the Dakotas and 

 Colorado. 



Weeds of Yards. The weeds of yards, especially of 

 barnyards, also vary greatly. In nearly all cases they are 

 such as can stand considerable tramping over, or else 

 they are weeds that are avoided by stock, because of 

 siome injurious properties residing in the plants. In the 

 North the most common barnyard weeds are dog fennel, 

 barnyard grass, cheeses or small mallow, Jimson weed, 

 dock, fetid marigold (in Iowa, Nebraska to Kansas), 

 smartweed and dooryard knotweed. In the Southwest, 

 buffalo bur and smartweed are common. 



Weeds of Lawns. Blue grass, during the dry season, 

 may become weedy. In the greater part of the Missis- 

 sippi valley, the most common weed on lawns is the 

 smooth crab grass which fruits so closely to the surface 

 of the ground that the lawn mower will not catch all of 

 the seeds. Yellow foxtail or pigeon grass is also com- 

 mon where the lawn is not properly cut. Chickweed is 

 one of the most common weeds in the North. Dandelion 

 is one of the most common weeds in lawns in the North- 

 west. Cat's-ear (Hypochacris radicata) is common on the 

 Pacific coast, in Washington and Oregon. 



